Just this week the truck started taking longer and longer to start, sometimes it takes a couple minutes before it will even fire. When it does fire, I have to hit the accelerator immediately to keep it from dying. when the truck idles, the check gauges light comes on because the oil pressure gauge is at 0, but as soon as the accelerator is tapped, the gauge reads normal until it drops back down to idle again.

Aside from initial startup though, the truck runs fine.

Any ideas?